> using a new kernel (ExecSG) built by Hyperion

Rather built by the Frieden brothers and licensed to Hyperion :-) There was even a declaratory action about this.

> There is a 'classic' version that runs on Commodore Amigas equipped with a PPC expansion.

...and on WinUAE/FS-UAE emulating the same.

> MorphOS [...] runs on Sam, Genesi and Apple PowerPC hardware
> (Sam460-ex/cr, Pegasos I, Pegasos II

...Efika 5200B :-)

> nearly all Apple G4 desktops/laptops/minis/all-in-ones, some PowerMac G5s).

iMac "all-in-ones" are not supported at all.

> AmigaOS4.x was built by the people who ported Freespace and Shogo from linux to AmigaOS

Hyperion ported Freespace from Windows to AmigaOS, and they ported Shogo from Windows to Linux, MacOS and AmigaOS.

> When running on the same hardware MorphOS outperforms AmigaOS in most (all?) areas

Do you have some benchmark results for MorphOS vs. OS4 on Sam460? (You know, comparing them on Pegasos II is unfair towards OS4 because <put idiotic reason here>.)

> Amiga Forever and AmiKit [...] are emulation packages [...].

AmiKit is more like a pre-configured software package as it lacks the Amiga Kickstart ROM and OS. So it is advised to use AmiKit in conjunction with Amiga Forever, complementing each other.